<template>
    <view>
        
        <!-- 搜索组件-->
        <my-search :bgcolor="'#d81e06'" :radius="20" @my-click="gotoSearch"></my-search>
        
        <view class="scroll-view-container">
            <!-- 左侧滚动视图-->
            <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
                <block v-for="(item , i) in cateList" :key="i">
                    <view :class="['left-scroll-view-item', i === active?'active':'']" @click="activeChanged(i)">{{item.cat_name}}</view>
                </block>
            </scroll-view>
            <!-- 右侧滚动视图-->
            <scroll-view class="right-scroll-view" scroll-y :style="{height: wh +'px'}" :scroll-top="scrollTop">
                <view class="cate-lv2" v-for="(item2 , i2) in cateLevel2" :key="i2">
                    <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
                    <!-- 动态渲染 列表数据-->
                    <view class="cate-lv3-list">
                        <view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                            <image :src="item3.cat_icon"></image>
                            <text>{{item3.cat_name}}</text>
                        </view>
                    </view>
                </view>
            </scroll-view>
        </view>
    </view>
</template>

<script>
    import badgeMix  from '../../mixins/tabbar-badge.js';
    
    export default {
        mixins: [badgeMix],
        data() {
            return {
                wh: 0,
                active: 0,
                scrollTop: 0,
                cateList:[],
                cateLevel2: []
            }
        },
        methods: {
            async getCateList(){
                const {data:res} = await uni.$http.get('/api/public/v1/categories')
                if(res.meta.status !== 200) return uni.$shwoMsg()
                this.cateList = res.message
                this.cateLevel2 = res.message[0].children
            },
            activeChanged(i){
                this.active = i;
                // 内容坐标重新定位
                this.cateLevel2 = this.cateList[i].children
                // 转换 1/0
                this.scrollTop = this.scrollTop ? 0 : 1
            },
            gotoGoodsList(item3){
                uni.navigateTo({
                    url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
                })
            },
            gotoSearch(){
                uni.navigateTo({
                    url:'/subpkg/search/search'
                })
            }
        },
        onLoad() {
            // 获取系统信息
            const sysInfo = uni.getSystemInfoSync()
            // 根据系统信息中的高度 为 wh 赋予值
            this.wh = sysInfo.windowHeight
            this.getCateList()
        }
    }
</script>

<style lang="scss">
    .scroll-view-container{
        display: flex;
        
        .left-scroll-view{
            width: 120px;
            
            .left-scroll-view-item{
                line-height:60px;
                background-color: #f7f7f7;
                text-align: center;
                font-size: 12px;
                
                // 实现样式情况 : 既包含 .left-scroll-view-item 也包含 active 
                &.active{
                    background-color: #ffffff;
                    position: relative;
                    
                    // 渲染激活项左侧的红色指示边线
                    &::before {
                        content: ' ';
                        display: block;
                        width: 3px;
                        height: 30px;
                        background-color: #d81e06;
                        position: absolute;
                        left: 0;
                        top: 50%;
                        transform: translateY(-50%);
                    }
                    
                }
                
            }
            
        } 
        
        .cate-lv2-title{
            font-size: 12px;
            font-weight: bold;
            text-align: center;
            padding: 15px 0;
        }
        
        .cate-lv3-list{
            display: flex;
            flex-wrap: wrap;
            
            .cate-lv3-item{
                width: 33.33%;
                margin-bottom: 10px;
                display: flex;
                flex-direction: column;
                align-items: center;
                
                image{
                    width: 60px;
                    height: 60px;
                }
                
                text{
                    font-size: 12px;
                }
            }
        }
        
        
    }
</style>
